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Thread: MK18 MOD1 Technical Thread

  1. #191
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    Quote Originally Posted by Eurodriver View Post
    I bought a 16" DD barrel and cut it to 10.3" without adjusting the gas port. Pinned the gas block and it runs like butter suppressed.

    Even suppressing a "good" SBR with a "correct" gas port is going to over gas the weapon.
    Exactly. DD uses a .058'' gas port on their 16.1'' guns, if I remember right.

    IMO .058'' is much closer to ideal (.062'') on an SBR than .071'' is.
    We miss you, AC.
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  2. #192
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    So while an adjustable gas block is probably ideal, without completing the install of one is it totally wrong to attempt to tone things down from the other end of the rifle?

    Currently I have an A5 (with their standard buffer) and LMT enhanced carrier/bolt; my rifle still seems snappy when suppressed (Mini-4), so I think I could stand to jump up at least one buffer weight - probably two.

  3. #193
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    I'd bump up to an A5 - 3. It's almost a full ounce heavier.
    "What would a $2,000 Geissele Super Duty do that a $500 PSA door buster on Black Friday couldn't do?" - Stopsign32v

  4. #194
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    Quote Originally Posted by markm View Post
    I'd bump up to an A5 - 3. It's almost a full ounce heavier.
    Thanks, I was/am debating between the 3 or 4; I would rather not purchase both if possible.

  5. #195
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    Quote Originally Posted by markm View Post
    I'd bump up to an A5 - 3. It's almost a full ounce heavier.
    +1

    That's what I was running on my 10.3" prior to adding the adjustable GB and it ran great with anything I put through it (M193/M855 down to Wolf).

    I've since went back to the A5-H2 (5.3oz) after swapping over to the Syrac GB.

    Quote Originally Posted by BTL BRN View Post
    Thanks, I was/am debating between the 3 or 4; I would rather not purchase both if possible.
    I just swapped out the internal weights to make an A5-H2 an A5-H3. I had a couple H-buffers laying around that donated the needed weights. Much cheaper than buying multiple A5 buffers.
    Last edited by thecolter; 03-26-14 at 14:35.

  6. #196
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    Quote Originally Posted by Magic_Salad0892 View Post
    Exactly. DD uses a .058'' gas port on their 16.1'' guns, if I remember right.

    IMO .058'' is much closer to ideal (.062'') on an SBR than .071'' is.
    .062" is the ideal size for a 14.5" M4, .071 is ideal for the Mk18.

    .083" is insanely overgasses.
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    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

  7. #197
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    Will the RIS II fit over the clamp on Syrac? I'm assuming it fits over the set screw version.
    "A flute without holes, is not a flute. A donut without a hole, is a Danish." - Ty Webb

  8. #198
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    Quote Originally Posted by Dirtyboy333 View Post
    I wonder why DD would only overgas their "commercial" MK18 and not their other commercial rifles?
    Most commercial buyers buy cheap ammo and gun show reloads. A larger gas port is more forgiving. Better that than having to RMA hundreds of uppers because "they won't run".

  9. #199
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    Quote Originally Posted by Magic_Salad0892 View Post
    Exactly. DD uses a .058'' gas port on their 16.1'' guns, if I remember right.

    IMO .058'' is much closer to ideal (.062'') on an SBR than .071'' is.
    So if you had a DD barrel that is going to be cut to 10.3, how large would you drill the gas port?

  10. #200
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    Quote Originally Posted by mattg1024 View Post
    So if you had a DD barrel that is going to be cut to 10.3, how large would you drill the gas port?
    .071" is the proper spec.
    Quote Originally Posted by C4IGrant View Post
    Colt builds War Horses, not show ponies.
    Quote Originally Posted by Iraqgunz View Post
    This is 2012. The world is going to end this December and people are still trying to debate the merits of piece of shit, cost cutting crap AR's. Really?

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